When the values of a union datatype are validated, they’re validated in the order in which they’re defined : union « XML Schema « XML Tutorial

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3.80.3.When the values of a union datatype are validated, they’re validated in the order in which they’re defined

<!-- schema -->

<xsd:element name="dog">

  <xsd:simpleType>

   <xsd:union>

    <xsd:simpleType>

    <xsd:restriction base="nonNegativeInteger"/>

   </xsd:simpleType>

   <xsd:simpleType>

   <xsd:restriction base="string"/>

   </xsd:simpleType>

  </xsd:union>

  </xsd:simpleType>

 </xsd:element>

<!-- instance document -->

<dog>15</dog>

<dog>hound</dog>

3.80.union
	3.80.1.	By declaring a , you can validate the values in your instance document against multiple types.
	3.80.2.	The union method joins the value spaces and lexical spaces of one or more datatypes to derive a new type
	3.80.3.	When the values of a union datatype are validated, they’re validated in the order in which they’re defined

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